GOP (Group of Pictures) structure
Definition
The pattern of I-frames, P-frames, and B-frames in a compressed video stream. Different cameras use different GOP lengths and frame-type ratios, which are firmware-determined and consistent across recordings from the same device.
Related terms
- Bitrate profile
- The pattern of bitrate variation across time in a variable-bitrate recording. A camera's rate-control algorithm allocates more bits to complex scenes and...
- Codec fingerprint
- The characteristic pattern of encoding decisions made by a camera's firmware when compressing video: the specific H.264 or H.265 profile and level,...
- Colour pipeline
- The sequence of transformations applied to raw sensor data to produce the encoded video signal, including white balance, gamma curve, colour space...
- PRNU (Photo Response Non-Uniformity)
- The unique pattern of pixel-level sensitivity variations in a camera sensor, used as a device fingerprint. A genuine camera-original image carries the...
- Reference profile
- A database of known parameter values built from recordings made with the suspect device under controlled conditions. Comparison of the questioned video...
Explained in
- Matching Video to a Source CameraThe pattern of I-frames, P-frames, and B-frames in a compressed video stream. Different cameras use different GOP lengths and frame-type ratios, which are firm...